參數(shù)資料
型號: XRT75R12IB-L
廠商: Exar Corporation
文件頁數(shù): 85/90頁
文件大?。?/td> 0K
描述: IC LIU E3/DS3/STS-1 12CH 420TBGA
標準包裝: 40
類型: 線路接口裝置(LIU)
驅動器/接收器數(shù): 12/12
規(guī)程: DS3,E3,STS-1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 420-LBGA 裸露焊盤
供應商設備封裝: 420-TBGA(35x35)
包裝: 托盤
XRT75R12
83
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
REV. 1.0.4
Each channel contains a dedicated 16 bit PRBS error counter. When enabled this counter will accumulate
PRBS errors (as well as excess zeros and LCVs). The LS byte will "carry" a one over to the MS byte each time
it rolls over from 255 to zero until the MS byte also reaches 255. When both counters reach 255, no further
errors will be accumulated and "all ones" will signify an overflow condition.
The counter can be read while in the active count mode. Either register may be read "on the fly" and the other
byte will be simultaneously transferred into the channel’s Error Holding register. The holding register may then
be read to supply the Host with a correct 16 bit count (as of the instant of reading). With this mechanism, the
Host could rapidly cycle thru reading all twelve counters in order (storing the read byte in scratch RAM) and
then come back and read the second byte from each holding register to form the 16 bit accumulation in the
Host system.
TABLE 47: XRT75R12 REGISTER MAP SHOWING ERROR COUNTER HOLDING REGISTERS (EH_N)
ADDRESS
LOCATION
0
1
2
3
4
5
6
7
8
9
A
B
C
D E
F
0x0-
APST
IER0
ISR0
AS0
TC0
RC0
CC0
JA0
APSR
EM0
EL0
EH0
0X1-
IER1
ISR1
AS1
TC1
RC1
CC1
JA1
EM1
EL1
EH1
0x2-
IER2
ISR2
AS2
TC2
RC2
CC2
JA2
EM2
EL2
EH2
0x3-
IER3
ISR3
AS3
TC3
RC3
CC3
JA3
EM3
EL3
EH3
0x4-
IER4
ISR4
AS4
TC4
RC4
CC4
JA4
EM4
EL4
EH4
0x5-
IER5
ISR5
AS5
TC5
RC5
CC5
JA5
EM5
EL5
EH5
0x6-
CIE
CIS
PN VN
0x7-
0x8-
APST
IER6
ISR6
AS6
TC6
RC6
CC6
JA6
APSR
EM6
EL6
EH6
0X9-
IER7
ISR7
AS7
TC7
RC7
CC7
JA7
EM7
EL7
EH7
0xA-
IER8
ISR8
AS8
TC8
RC8
CC8
JA8
EM8
EL8
EH8
0xB-
IER9
ISR9
AS9
TC9
RC9
CC9
JA9
EM9
EL9
EH9
0xC-
IER10
ISR10
AS10
TC10
RC10
CC10
JA10
EM10
EL10
EH10
0xD-
IER11
ISR11
AS11
TC11
RC11
CC11
JA11
EM11
EL11
EH11
0xE-
CIE
CIS
0xF-
TABLE 48: ERROR COUNTER HOLDING REGISTER - CHANNEL N ADDRESS LOCATION = 0XMC
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Msb
Ls bit
R/W
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